The flow of air around an angled steel plate in a duct generates noise. Previous
experimental studies show that the noise is reduced if the plate is allowed to be
flexible, however the underlying mechanisms are not fully understood. Therefore it
is desirable to find an accurate and affordable numerical solution to the problem. In
this thesis, the stiff and the flexible plate are simulated using the commercial CFD
software Star CCM+. Sound generation is then estimated by applying a dipole
approximation of Curle’s acoustic analogy. The results show that the velocity field
and sound generation can be accurately predicted for the stiff plate and that the
Star CCM+ FSI solver accurately predicts the plate motion. However, the sound
reduction for the flexible plate is not captured. The reason for the discrepancies
between simulation and experiments in terms of sound generation are unclear, however
the motion of the plate is believed to make the dipole sound approximation an
unsuitable approach.

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HarvardJansson, M. och Åblad, M. (2016) On the Effect of Flexibility for In-Duct Plates with Focus on Aeroacoustics. Göteborg : Chalmers University of Technology (Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, nr: 2016:14).

BibTeX @mastersthesis{Jansson2016,author={Jansson, Magdalena and Åblad, Märta},title={On the Effect of Flexibility for In-Duct Plates with Focus on Aeroacoustics},abstract={The flow of air around an angled steel plate in a duct generates noise. Previous
experimental studies show that the noise is reduced if the plate is allowed to be
flexible, however the underlying mechanisms are not fully understood. Therefore it
is desirable to find an accurate and affordable numerical solution to the problem. In
this thesis, the stiff and the flexible plate are simulated using the commercial CFD
software Star CCM+. Sound generation is then estimated by applying a dipole
approximation of Curle’s acoustic analogy. The results show that the velocity field
and sound generation can be accurately predicted for the stiff plate and that the
Star CCM+ FSI solver accurately predicts the plate motion. However, the sound
reduction for the flexible plate is not captured. The reason for the discrepancies
between simulation and experiments in terms of sound generation are unclear, however
the motion of the plate is believed to make the dipole sound approximation an
unsuitable approach.},publisher={Institutionen för tillämpad mekanik, Strömningslära, Chalmers tekniska högskola},place={Göteborg},year={2016},series={Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, no: 2016:14},keywords={CFD, FSI, aeroacoustics, Curle’s acoustic analogy, vortex mixer plate noise reduction. },}

RefWorks RT GenericSR ElectronicID 238187A1 Jansson, MagdalenaA1 Åblad, MärtaT1 On the Effect of Flexibility for In-Duct Plates with Focus on AeroacousticsT2 An Incompressible Computational Fluid Dynamics Study Using Fluid-Structure Interaction and Applying a Dipole Approximation of Curle’s Acoustic Analogy YR 2016AB The flow of air around an angled steel plate in a duct generates noise. Previous
experimental studies show that the noise is reduced if the plate is allowed to be
flexible, however the underlying mechanisms are not fully understood. Therefore it
is desirable to find an accurate and affordable numerical solution to the problem. In
this thesis, the stiff and the flexible plate are simulated using the commercial CFD
software Star CCM+. Sound generation is then estimated by applying a dipole
approximation of Curle’s acoustic analogy. The results show that the velocity field
and sound generation can be accurately predicted for the stiff plate and that the
Star CCM+ FSI solver accurately predicts the plate motion. However, the sound
reduction for the flexible plate is not captured. The reason for the discrepancies
between simulation and experiments in terms of sound generation are unclear, however
the motion of the plate is believed to make the dipole sound approximation an
unsuitable approach.PB Institutionen för tillämpad mekanik, Strömningslära, Chalmers tekniska högskola,PB Institutionen för tillämpad mekanik, Strömningslära, Chalmers tekniska högskola,T3 Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, no: 2016:14LA engLK http://publications.lib.chalmers.se/records/fulltext/238187/238187.pdfOL 30